Inverted type-I CdS/CdSe core/crown colloidal quantum ring

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buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.contributor.authorBose S.en_US
dc.contributor.authorDelikanlı, Savaşen_US
dc.contributor.authorAkgül, Mehmet Zaferen_US
dc.contributor.authorGao Y.en_US
dc.contributor.authorFan W.en_US
dc.contributor.authorZhang D.H.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.coverage.spatialMunich, Germanyen_US
dc.date.accessioned2018-04-12T11:47:37Z
dc.date.available2018-04-12T11:47:37Z
dc.date.issued2017en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.descriptionDate of Conference: 25-29 June 2017en_US
dc.description.abstractSummary form only given. Inverted Type-I quantum rings (QRs) are a recently developed class of nanostructure in which a lower bandgap material is laterally grown as a crown of same thickness around a higher bandgap nanoplatelet (NPL) core [l·2]· e.g. core/crown CdS/CdSe as shown in Fig. 1(a). For this work, we have colloidally synthesized 3 monolayer (ML) thick CdS/CdSe QR samples using seed-mediated method, by using 3ML CdS NPLs as the core seed [3]. Subsequently, continuous injection of Se precursor, elemental Se dissolved in octadecene (ODE), Cd precursor and Cd(CH3CO2)2 led to the growth of CdSe crown. The ring width was controlled by tuning the injection amount to regulate the extent of the lateral size of the crown coating. A TEM image of the 3ML CdS/CdSe QRs is shown in Fig. 1(b)· which suggests atomically flat lateral growth of CdSe on CdS NPLs, as it has larger average lateral size (30±10 nm) compared to the CdS core only NPLs. We have measured the photoluminescence (PL) and absorption spectra of CdS/CdSe QRs at different phases of crown growth. Fig. 1(c) shows the PL and absorption spectra for two contrasting cases having a (i) thin, and a (ii) thick CdSe crown. As the crown thickness increases, there is lesser extent of lateral confinement, and thus a red-shift in the PL peak position. Also the linewidth of the emission spectra narrows down as more CdSe is deposited in the crown. This is owing to the randomly dispersed CdSe islands of varying sizes formed around the CdS NPLs at the initial phase of the CdSe crown growth resulting in a normal distribution of energy levels. For a sufficiently thick CdSe crown, the electronic structure and optical properties of CdS/CdSe QR is identical to CdSe NPLs alone, characterized by narrower linewidths. Moreover, we have verified that the emission peak of the 3ML CdS/CdSe QRs is spectrally tunable between the peak emissions of 3ML CdS NPL core only (382 nm) and 3 ML CdSe NPL core only (462 nm). In terms of the absorpti...en_US
dc.identifier.doi10.1109/CLEOE-EQEC.2017.8086650en_US
dc.identifier.isbn9781557528209
dc.identifier.urihttp://hdl.handle.net/11693/37676
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttps://doi.org/10.1109/CLEOE-EQEC.2017.8086650en_US
dc.source.title2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)en_US
dc.titleInverted type-I CdS/CdSe core/crown colloidal quantum ringen_US
dc.typeConference Paperen_US

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